A butterfly-shaped cross-over main-tail inductor for a voltage-controlled oscillator

Abstract

The application provides a butterfly-shaped cross main-tail inductor for a voltage-controlled oscillator, relates to the technical field of phase noise optimization of a voltage-controlled oscillator, and aims to optimize the phase noise of the voltage-controlled oscillator without occupying more area. The butterfly-shaped cross main-tail inductor comprises a main inductor which is wound by a figure-of-eight metal wire, a tail inductor which is wound by a figure-of-eight metal wire, two metal interlayer vias, two main inductor ports and two tail inductor ports. The main inductor is used for providing the inductance required by LC voltage-controlled oscillator resonance. The tail inductor is used for filtering the noise generated by a tail current source, improving the impedance of a common mode point, and then improving the overall phase noise performance of the voltage-controlled oscillator. The metal interlayer via, the main inductor port and the tail inductor port are used for providing the wiring and circuit interface of the inductor. The application has the advantages of simple structure, reduced phase noise without improving the design of the voltage-controlled oscillator itself, reduced area occupation, and high cost performance.

Description

Technical Field

[0001] This invention belongs to the field of phase noise optimization technology for voltage-controlled oscillators, and particularly relates to a butterfly-shaped cross tail inductor for voltage-controlled oscillators. Background Technology

[0002] Voltage-controlled oscillators (VCOs) are widely used in modern communication, radar, and electronic systems, such as 5G communication, satellite navigation, and automotive electronics, to provide adjustable frequencies controlled by the input voltage. As the demands of wireless communication increase, oscillators must possess low phase noise. Because the phase noise performance of ring VCOs is significantly worse than that of LC VCOs, LC VCOs are typically chosen in modern RF systems.

[0003] Inductors are a crucial component of LC voltage-controlled oscillators (VCOs), occupying a significant portion of their area. Introducing an additional tail inductor is a popular method to further suppress phase noise in LC VCOs, including second harmonic resonance filtering and source-level inductor negative feedback, among other approaches. However, this often comes at the cost of sacrificing a substantial amount of area. For example, using source-level inductor negative feedback to reduce phase noise can ideally reduce it by approximately 10 dB, but this requires introducing three additional filter inductors, resulting in an unacceptable waste of area in practical applications.

[0004] Therefore, the urgent problem to be solved for LC voltage-controlled oscillators is to minimize phase noise within a limited area, thereby ensuring the low-noise performance of LC voltage-controlled oscillators. Summary of the Invention

[0005] The purpose of this invention is to provide a butterfly-shaped cross-tail inductor for voltage-controlled oscillators (VCOs), which can reduce the phase noise of VCOs within a limited area. This solves the technical problem in the prior art where reducing phase noise comes at the cost of sacrificing area.

[0006] To solve the above-mentioned technical problems, the specific technical solution of the present invention is as follows:

[0007] A butterfly-shaped cross-tail inductor for a voltage-controlled oscillator, the butterfly-shaped cross-tail inductor comprising a main inductor wound with a figure-eight metal wire, a tail inductor wound with a figure-eight metal wire, two metal interlayer vias, two main inductor ports and two tail inductor ports.

[0008] The main inductor, which is made of figure-eight shaped metal wire, includes two main inductor loops and a main inductor connecting line. The two ends of the main inductor connecting line are respectively connected to one end of a main inductor loop, and the other end of each main inductor loop is connected to the main inductor port.

[0009] The tail inductor, which is made of figure-eight shaped metal wire, includes two tail inductor rings and a tail inductor connecting line. The two ends of the tail inductor connecting line are respectively connected to one end of a tail inductor ring, and the other end of each tail inductor ring is connected to the tail inductor port.

[0010] The main inductor and the tail inductor wound with the figure-eight metal wire are centrally symmetrical and are arranged in a multi-layer metal structure under the same process. The main inductor, two main inductor ports and two tail inductor ports are arranged on the top layer of the metal layer, and the tail inductor is arranged on the second layer of the metal layer.

[0011] The through-hole between the metal layers is used to connect the tail inductor ring and the tail inductor port of the two metal layers.

[0012] The main inductor port and the tail inductor port are used for the connection between the inductor and the voltage-controlled oscillator circuit.

[0013] Furthermore, the main inductor formed by winding the figure-eight metal wire includes a first ring of the figure-eight main inductor, a second ring of the figure-eight main inductor, and a main inductor connecting wire.

[0014] The first and second loops of the figure-eight main inductor are connected by a main inductor connecting line. The first loop of the figure-eight main inductor is located in the first quadrant of the coordinate system with the center as the origin, and the second loop of the figure-eight main inductor is located in the third quadrant of the coordinate system. The main inductor connecting line is located on the longitudinal coordinate axis of the coordinate system.

[0015] The main inductor port includes a first main inductor port and a second main inductor port.

[0016] The first port of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the first ring of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor; the second port of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the second ring of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor.

[0017] Furthermore, the tail inductor formed by winding the figure-eight metal wire includes a first ring of the figure-eight tail inductor, a second ring of the figure-eight tail inductor, and a tail inductor connecting wire.

[0018] The first and second loops of the figure-eight tail inductor are connected by a tail inductor connecting line. The first loop of the figure-eight tail inductor is located in the second quadrant of the coordinate system, and the second loop of the figure-eight tail inductor is located in the fourth quadrant of the coordinate system. The tail inductor connecting line is located on the horizontal coordinate axis of the coordinate system.

[0019] The tail inductor port includes a tail inductor first port and a tail inductor second port.

[0020] The first port of the tail inductor is located in the second quadrant near the longitudinal axis and bends inward toward the inside of the figure-eight tail inductor. The second port of the tail inductor is located in the fourth quadrant near the longitudinal axis and bends inward toward the inside of the figure-eight tail inductor.

[0021] Furthermore, the first ring of the figure-eight main inductor, the second ring of the figure-eight main inductor, the first port of the main inductor, the second port of the main inductor, the main inductor connecting line, the first port of the tail inductor, and the second port of the tail inductor are located on the top layer of the metal layer; the first ring of the figure-eight tail inductor, the second ring of the figure-eight tail inductor, and the tail inductor connecting line are located on the second layer of the metal layer.

[0022] The interlayer vias include a first interlayer via and a second interlayer via, wherein the first interlayer via is located in the second quadrant of the coordinate system and the second interlayer via is located in the fourth quadrant of the coordinate system.

[0023] The first metal interlayer via connects the first ring of the figure-eight tail inductor and the first port of the tail inductor, and the second metal interlayer via connects the second ring of the figure-eight tail inductor and the second port of the tail inductor.

[0024] Furthermore, the main inductor formed by winding the figure-eight metal wire includes a first ring of the figure-eight main inductor, a second ring of the figure-eight main inductor, and a main inductor connecting wire.

[0025] Optionally, the first ring and the second ring of the figure-eight main inductor are connected by a main inductor connecting line. The first ring of the figure-eight main inductor is located in the second quadrant of the coordinate system with the center as the origin, and the second ring of the figure-eight main inductor is located in the fourth quadrant of the coordinate system. The main inductor connecting line is located on the horizontal coordinate axis of the coordinate system.

[0026] The main inductor port includes a first main inductor port and a second main inductor port.

[0027] The first port of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the first ring of the figure-eight main inductor, bending inward toward the inside of the figure-eight main inductor; the second port of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the second ring of the figure-eight main inductor, bending inward toward the inside of the figure-eight main inductor.

[0028] Furthermore, the tail inductor formed by winding the figure-eight metal wire includes a first ring of the figure-eight tail inductor, a second ring of the figure-eight tail inductor, and a tail inductor connecting wire.

[0029] Optionally, the first and second loops of the figure-eight tail inductor are connected by a tail inductor connecting line. The first loop of the figure-eight tail inductor is located in the first quadrant of the coordinate system, and the second loop of the figure-eight tail inductor is located in the third quadrant of the coordinate system. The tail inductor connecting line is located on the longitudinal axis of the coordinate system.

[0030] The tail inductor port includes the tail inductor first port and the tail inductor second port.

[0031] The first port of the tail inductor is located in the fourth quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor; the second port of the tail inductor is located in the second quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor.

[0032] Furthermore, the first ring of the figure-eight main inductor, the second ring of the figure-eight main inductor, the first port of the main inductor, the second port of the main inductor, the main inductor connecting line, the first port of the tail inductor, and the second port of the tail inductor are located on the top layer of the metal layer. The first ring of the figure-eight tail inductor, the second ring of the figure-eight tail inductor, and the tail inductor connecting line are located on the second layer of the metal layer.

[0033] The interlayer vias include a first interlayer via and a second interlayer via, wherein the first interlayer via is located in the fourth quadrant of the coordinate system and the second interlayer via is located in the second quadrant of the coordinate system.

[0034] The first metal interlayer via connects the first ring of the figure-eight tail inductor and the first port of the tail inductor, and the second metal interlayer via connects the second ring of the figure-eight tail inductor and the second port of the tail inductor.

[0035] Furthermore, the first and second loops of the figure-eight main inductor are symmetrically distributed about the origin of the coordinate system; the first and second loops of the figure-eight tail inductor are also symmetrically distributed about the origin of the coordinate system.

[0036] Furthermore, the first port and the second port of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port and the second port of the tail inductor are symmetrically distributed about the origin of the coordinate system.

[0037] Furthermore, the main inductor, wound with a figure-eight shaped metal wire, is connected to the resonant circuit of any LC voltage-controlled oscillator through the main inductor port to provide the frequency required for resonance. The tail inductor, wound with a figure-eight shaped metal wire, is connected to the common-mode point of the tail current of the voltage-controlled oscillator through the tail inductor port. The frequency generated by the butterfly-shaped crossed main and tail inductors in the resonant circuit can be expressed as:

[0038]

[0039]

[0040] in, The resonant frequency of the main inductor in the butterfly-shaped cross-tail inductor is... The inductance value of the main inductor is made of figure-eight shaped metal wire. This refers to the main capacitor value of the voltage-controlled oscillator. The resonant frequency of the tail inductor in the butterfly-shaped cross-type main tail inductor, located at the second harmonic, provides a filtering function. The inductance value of the tail inductor, which is made of figure-eight shaped metal wire. This is the value of the filter capacitor.

[0041] Compared with the prior art, the present invention has the following beneficial technical effects:

[0042] 1) This invention optimizes the inductor structure distribution based on the inductors traditionally used in LC voltage-controlled oscillators and introduces a tail inductor. The phase noise of the LC voltage-controlled oscillator can be optimized through simple improvements.

[0043] 2) The present invention sets up two sets of symmetrical figure-eight inductors, which helps to improve the utilization efficiency of chip area and further reduce the phase noise of voltage-controlled oscillator within the effective area.

[0044] 3) This invention uses through-holes between metal layers to route the main inductor and the tail inductor in different metal layers, avoiding short circuits and interference between inductors. At the same time, the figure-eight inductor winding method can cancel out the magnetic fields of the inductors, reducing interference to other circuit modules.

[0045] 4) The present invention is reasonably designed and has a simple structure. It can reduce phase noise without modifying the voltage-controlled oscillator itself, while minimizing the area occupied. It is easy to manufacture and has a high cost performance. Attached Figure Description

[0046] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This invention provides a schematic diagram of a butterfly-shaped cross-tail inductor for a voltage-controlled oscillator.

[0048] Figure 2 A schematic diagram of the circuit structure of the butterfly-shaped cross-tail inductor provided by the present invention applied to a voltage-controlled oscillator.

[0049] Figure 3 This is a schematic diagram of another butterfly-shaped cross tail inductor for a voltage-controlled oscillator provided by the present invention.

[0050] The markings in the diagram are as follows: 101 - First ring of the figure-eight main inductor; 102 - Second ring of the figure-eight main inductor; 103 - First port of the main inductor; 104 - Second port of the main inductor; 105 - Main inductor connecting wire; 201 - First ring of the figure-eight tail inductor; 202 - Second ring of the figure-eight tail inductor; 203 - First port of the tail inductor; 204 - Second port of the tail inductor; 205 - Tail inductor connecting wire; 206 - First metal layer through-hole; 207 - Second metal layer through-hole. Detailed Implementation

[0051] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0052] Example 1

[0053] This embodiment provides a butterfly-shaped cross-tail inductor for a voltage-controlled oscillator, such as Figure 1 As shown, the butterfly-shaped cross main and tail inductor includes a main inductor wound with a figure-eight metal wire, a tail inductor wound with a figure-eight metal wire, two metal interlayer vias, two main inductor ports and two tail inductor ports.

[0054] The main inductor, which is made of figure-eight shaped metal wire, includes two main inductor loops and a main inductor connecting line. The two ends of the main inductor connecting line are respectively connected to one end of a main inductor loop, and the other end of each main inductor loop is connected to the main inductor port.

[0055] The tail inductor, which is made of figure-eight shaped metal wire, includes two tail inductor rings and a tail inductor connecting line. The two ends of the tail inductor connecting line are respectively connected to one end of a tail inductor ring, and the other end of each tail inductor ring is connected to the tail inductor port.

[0056] The main inductor and the tail inductor wound with the figure-eight metal wire are centrally symmetrical and are arranged in a multi-layer metal structure under the same process. The main inductor, two main inductor ports and two tail inductor ports are arranged on the top layer of the metal layer, and the tail inductor is arranged on the second layer of the metal layer.

[0057] The through-hole between the metal layers is used to connect the tail inductor ring and the tail inductor port of the two metal layers.

[0058] The main inductor port and the tail inductor port are used for the connection between the inductor and the voltage-controlled oscillator circuit.

[0059] The main inductor, formed by winding the figure-eight shaped metal wire, includes a first ring 101 of the figure-eight shaped main inductor, a second ring 102 of the figure-eight shaped main inductor, and a main inductor connecting wire 105.

[0060] The figure-eight shaped main inductor first ring 101 and figure-eight shaped main inductor second ring 102 are connected by main inductor connecting line 105. The figure-eight shaped main inductor first ring 101 is set in the first quadrant of the coordinate system with the center as the origin, and the figure-eight shaped main inductor second ring 102 is set in the third quadrant of the coordinate system. The main inductor connecting line 105 is located on the longitudinal coordinate axis of the coordinate system.

[0061] The main inductor port includes a first main inductor port 103 and a second main inductor port 104; the tail inductor port includes a first tail inductor port 203 and a second tail inductor port 204.

[0062] The first port 103 of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the first ring 101 of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor; the second port 104 of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the second ring 102 of the figure-eight main inductor, bending outwards towards the outside of the figure-eight main inductor.

[0063] The first ring 101 of the figure-eight main inductor, the second ring 102 of the figure-eight main inductor, the first port 103 of the main inductor, the second port 104 of the main inductor, the main inductor connecting wire 105, and the first port 203 and the second port 204 of the tail inductor are located on the top layer of the metal layer. The first ring 201 of the figure-eight tail inductor, the second ring 202 of the figure-eight tail inductor, and the tail inductor connecting wire 205 are located on the second layer of the metal layer.

[0064] The tail inductor, formed by winding the figure-eight metal wire, includes a first ring 201 of the figure-eight tail inductor, a second ring 202 of the figure-eight tail inductor, and a tail inductor connecting wire 205.

[0065] The first ring 201 and the second ring 202 of the figure-eight tail inductor are connected by a tail inductor connecting line 205. The first ring 201 of the figure-eight tail inductor is located in the second quadrant of the coordinate system, and the second ring 202 of the figure-eight tail inductor is located in the fourth quadrant of the coordinate system. The tail inductor connecting line 205 is located on the horizontal coordinate axis of the coordinate system.

[0066] The first port 203 of the tail inductor is located in the second quadrant near the longitudinal coordinate axis and bends inward toward the inside of the figure-eight tail inductor; the second port 204 of the tail inductor is located in the fourth quadrant near the longitudinal coordinate axis and bends inward toward the inside of the figure-eight tail inductor.

[0067] The interlayer metal via includes a first interlayer metal via 206 and a second interlayer metal via 207. The first interlayer metal via 206 is located in the second quadrant of the coordinate system, and the second interlayer metal via 207 is located in the fourth quadrant of the coordinate system.

[0068] The first metal interlayer via 206 connects the first ring 201 of the figure-eight tail inductor and the first port 203 of the tail inductor, and the second metal interlayer via 207 connects the second ring 202 of the figure-eight tail inductor and the second port 204 of the tail inductor.

[0069] The first ring 101 and the second ring 102 of the figure-eight main inductor are symmetrically distributed about the origin of the coordinate system.

[0070] The first ring 201 and the second ring 202 of the figure-eight tail inductor are symmetrically distributed about the origin of the coordinate system.

[0071] The first port 103 and the second port 104 of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port 203 and the second port 204 of the tail inductor are symmetrically distributed about the origin of the coordinate system.

[0072] Based on the technical solution of this embodiment, the first port 103 and the second port 104 of the main inductor are connected to the resonant circuit of any LC voltage-controlled oscillator to provide the frequency required for resonance. The first port 203 and the second port 204 of the tail inductor are connected to the common-mode point of the tail current of the voltage-controlled oscillator, forming a resonant circuit with the tail current filter capacitor of the voltage-controlled oscillator to resonate at the second harmonic of the voltage-controlled oscillator resonant frequency. Since the main inductor and the tail inductor, which are wound with figure-eight metal wires, are arranged symmetrically about the coordinate system, the magnetic fields of the inductors will not interfere with each other, and area is saved. The frequency generated by the butterfly-shaped cross main and tail inductors in the resonant circuit can be expressed as:

[0073]

[0074]

[0075] in, The resonant frequency of the main inductor in the butterfly-shaped cross-tail inductor is... The inductance value of the main inductor is made of figure-eight shaped metal wire. This refers to the main capacitor value of the voltage-controlled oscillator. The resonant frequency of the tail inductor in the butterfly-shaped cross-type main tail inductor, located at the second harmonic, provides a filtering function. The inductance value of the tail inductor, which is made of figure-eight shaped metal wire. This is the value of the filter capacitor.

[0076] Based on the above, the butterfly-shaped cross tail inductor can be used for low phase noise and low area requirements of voltage-controlled oscillators, which helps to improve the noise performance of voltage-controlled oscillators.

[0077] The following section further explains how the butterfly-shaped cross-tail inductor can be applied to a voltage-controlled oscillator, based on the aforementioned butterfly-shaped cross-tail inductor. Figure 2 This illustration shows a schematic diagram of a voltage-controlled oscillator (VCO) based on the butterfly-shaped cross-tail inductor provided in an embodiment of this application. The VCO includes: a main inductor forming a resonant circuit consisting of a first ring 101 of a figure-eight-shaped main inductor, a second ring 102 of a figure-eight-shaped main inductor, a first port 103 of a main inductor, a second port 104 of a main inductor, and a main inductor connecting line 105; a tail inductor forming a resonant circuit consisting of a first ring 201 of a figure-eight-shaped tail inductor, a second ring 202 of a figure-eight-shaped tail inductor, a first port 203 of a tail inductor, a second port 204 of a tail inductor, a tail inductor connecting line 205, a first inter-metal via 206, and a second inter-metal via 207; and a VCO assembly.

[0078] It should be noted that this application does not impose specific limitations on the internal structure of the voltage-controlled oscillator component, and specific adjustments can be made according to the actual application scenario.

[0079] The method for using the butterfly-shaped cross-tail inductor to achieve voltage-controlled oscillation in a voltage-controlled oscillator is as follows:

[0080] The main inductor, formed by winding the figure-eight shaped metal wire, is connected to the voltage-controlled oscillator (LC) oscillation circuit through the first and second ports of the main inductor to provide the required main inductance value, which varies according to the voltage-controlled capacitance.

[0081]

[0082] in, This is the capacitance value after voltage control. This is the intrinsic capacitance value not controlled by voltage. It is a non-linear exponent. This is an external voltage control signal. This is the potential required for the capacitor to reach its maximum value.

[0083] The voltage-controlled oscillation frequency is obtained:

[0084]

[0085] in The inductance value of the main inductor of the resonant circuit. This refers to the oscillation frequency output by the voltage-controlled oscillator.

[0086] The tail inductor, formed by winding the figure-eight metal wire, is connected to the common mode point of the voltage-controlled oscillator through the first and second ports of the tail inductor. Together with the tail current filter capacitor of the voltage-controlled oscillator, it forms a resonant circuit that resonates at the second harmonic of the voltage-controlled oscillator's resonant frequency. This increases the impedance of the common mode point, suppresses the decrease in the quality factor of the inductor-capacitor resonant circuit caused by the negative resistance pair, and achieves resonant filtering.

[0087] Example 2

[0088] Figure 3 Another butterfly-shaped cross tail inductor for voltage-controlled oscillators is shown.

[0089] The main inductor, formed by winding the figure-eight shaped metal wire, includes a first ring 101 of the figure-eight shaped main inductor, a second ring 102 of the figure-eight shaped main inductor, and a main inductor connecting wire 105.

[0090] The figure-eight shaped main inductor first ring 101 and figure-eight shaped main inductor second ring 102 are connected by main inductor connecting line 105. The figure-eight shaped main inductor first ring 101 is set in the second quadrant of the coordinate system with the center as the origin, and the figure-eight shaped main inductor second ring 102 is set in the fourth quadrant of the coordinate system. The main inductor connecting line 105 is located on the horizontal coordinate axis of the coordinate system.

[0091] The main inductor port includes a first main inductor port 103 and a second main inductor port 104; the tail inductor port includes a first tail inductor port 203 and a second tail inductor port 204.

[0092] The first port 103 of the main inductor is located in the second quadrant near the lateral coordinate axis and is connected to the first ring 101 of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor; the second port 104 of the main inductor is located in the fourth quadrant near the lateral coordinate axis and is connected to the second ring 102 of the figure-eight main inductor, bending towards the inside of the figure-eight main inductor.

[0093] The first ring 101 of the figure-eight main inductor, the second ring 102 of the figure-eight main inductor, the first port 103 of the main inductor, the second port 104 of the main inductor, the main inductor connecting wire 105, and the first port 203 and the second port 204 of the tail inductor are located on the top layer of the metal layer. The first ring 201 of the figure-eight tail inductor, the second ring 202 of the figure-eight tail inductor, and the tail inductor connecting wire 205 are located on the second layer of the metal layer.

[0094] The tail inductor, formed by winding the figure-eight metal wire, includes a first ring 201 of the figure-eight tail inductor, a second ring 202 of the figure-eight tail inductor, and a tail inductor connecting wire 205.

[0095] The first ring 201 and the second ring 202 of the figure-eight tail inductor are connected by a tail inductor connecting line 205. The first ring 201 of the figure-eight tail inductor is located in the first quadrant of the coordinate system, and the second ring 202 of the figure-eight tail inductor is located in the third quadrant of the coordinate system. The tail inductor connecting line 205 is located on the longitudinal coordinate axis of the coordinate system.

[0096] The first port 203 of the tail inductor is located in the fourth quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor; the second port 204 of the tail inductor is located in the second quadrant near the lateral coordinate axis and bends outward towards the outside of the figure-eight tail inductor.

[0097] The interlayer metal via includes a first interlayer metal via 206 and a second interlayer metal via 207. The first interlayer metal via 206 is located in the fourth quadrant of the coordinate system, and the second interlayer metal via 207 is located in the second quadrant of the coordinate system.

[0098] The first metal interlayer via 206 connects the first ring 201 of the figure-eight tail inductor and the first port 203 of the tail inductor, and the second metal interlayer via 207 connects the second ring 202 of the figure-eight tail inductor and the second port 204 of the tail inductor.

[0099] The first ring 101 and the second ring 102 of the figure-eight main inductor are symmetrically distributed about the origin of the coordinate system.

[0100] The first ring 201 and the second ring 202 of the figure-eight tail inductor are symmetrically distributed about the origin of the coordinate system.

[0101] The first port 103 and the second port 104 of the main inductor are symmetrically distributed about the origin of the coordinate system, and the first port 203 and the second port 204 of the tail inductor are symmetrically distributed about the origin of the coordinate system.

[0102] The butterfly-shaped cross-tail inductor can be used for low phase noise and low area requirements of voltage-controlled oscillators, which helps to improve the noise performance of voltage-controlled oscillators.

[0103] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A butterfly-shaped cross- primary-antenna inductor for a voltage-controlled oscillator, characterized by, The butterfly-shaped cross main-tail inductor comprises a main inductor of a splayed metal wire winding, a tail inductor of a splayed metal wire winding, two metal interlayer vias, two main inductor ports and two tail inductor ports; The main inductor of the splayed metal wire winding comprises two main inductor rings and a main inductor connecting line, two ends of the main inductor connecting line are respectively connected to one end of one main inductor ring, and the other end of each main inductor ring is connected to a main inductor port; the main inductor is connected to the resonance loop of the LC voltage-controlled oscillator through the main inductor port to provide the required frequency for resonance; The tail inductor of the splayed metal wire winding comprises two tail inductor rings and a tail inductor connecting line, two ends of the tail inductor connecting line are respectively connected to one end of one tail inductor ring, and the other end of each tail inductor ring is connected to a tail inductor port; The tail inductor is connected to the tail current common mode point of the voltage-controlled oscillator through the tail inductor port, and forms a resonance loop with the tail current filter capacitor of the voltage-controlled oscillator to resonate at the second harmonic of the resonance frequency of the voltage-controlled oscillator; The main inductor of the splayed metal wire winding and the tail inductor of the splayed metal wire winding are centrally symmetric and are arranged in the same process of multiple metal layers, wherein the main inductor of the splayed metal wire winding, the two main inductor ports and the two tail inductor ports are arranged in the top layer of the metal layer, and the tail inductor of the splayed metal wire winding is arranged in the second layer of the metal layer; The metal interlayer via is used to connect the tail inductor ring and the tail inductor port of two metal layers.

2. The butterfly-shaped crossed main-tail inductor for a voltage-controlled oscillator according to claim 1, wherein The main inductor of the splayed metal wire winding comprises a splayed main inductor first ring (101), a splayed main inductor second ring (102) and a main inductor connecting line (105); The splayed main inductor first ring (101) and the splayed main inductor second ring (102) are connected through the main inductor connecting line (105), the splayed main inductor first ring (101) is arranged in the first quadrant of the coordinate system with the center as the origin, the splayed main inductor second ring (102) is arranged in the third quadrant of the coordinate system, and the main inductor connecting line (105) is located on the longitudinal coordinate axis of the coordinate system; The main inductor port comprises a main inductor first port (103) and a main inductor second port (104); The main inductor first port (103) is located on the side close to the horizontal coordinate axis in the fourth quadrant, is connected to the splayed main inductor first ring (101) and is bent to the outside of the splayed main inductor; and the main inductor second port (104) is located on the side close to the horizontal coordinate axis in the second quadrant, is connected to the splayed main inductor second ring (102) and is bent to the outside of the splayed main inductor.

3. The butterfly-shaped cross- over main-tail inductor for a voltage-controlled oscillator according to claim 2, wherein The tail inductor of the splayed metal wire winding comprises a splayed tail inductor first ring (201), a splayed tail inductor second ring (202) and a tail inductor connecting line (205); The first loop (201) and the second loop (202) of the eight-shaped tail inductance are connected by a tail inductance connecting line (205), the first loop (201) is arranged in the second quadrant of the coordinate system, the second loop (202) is arranged in the fourth quadrant of the coordinate system, and the tail inductance connecting line (205) is located on the horizontal coordinate axis of the coordinate system; The tail inductance port comprises a tail inductance first port (203) and a tail inductance second port (204); The tail inductance first port (203) is located on the side close to the longitudinal coordinate axis of the second quadrant and is bent to the inside of the eight-shaped tail inductance; and the tail inductance second port (204) is located on the side close to the longitudinal coordinate axis of the fourth quadrant and is bent to the inside of the eight-shaped tail inductance.

4. The butterfly-shaped cross- over main-tail inductor for a voltage-controlled oscillator according to claim 3, wherein The first loop (101), the second loop (102), the first port (103), the second port (104), the main inductance connecting line (105), the tail inductance first port (203) and the tail inductance second port (204) are located on the top layer of the metal layer; the first loop (201) and the second loop (202) of the eight-shaped tail inductance are located on the second layer of the metal layer; The metal layer interlayer via hole comprises a first metal layer interlayer via hole (206) and a second metal layer interlayer via hole (207), the first metal layer interlayer via hole (206) is located in the second quadrant of the coordinate system, and the second metal layer interlayer via hole (207) is located in the fourth quadrant of the coordinate system; The first metal layer interlayer via hole (206) connects the first loop (201) and the tail inductance first port (203) of the eight-shaped tail inductance, and the second metal layer interlayer via hole (207) connects the second loop (202) and the tail inductance second port (204) of the eight-shaped tail inductance.

5. The butterfly-shaped cross-primaries-tails inductor for voltage-controlled oscillator according to claim 1, wherein, The main inductance wound by the eight-shaped metal wire comprises the first loop (101), the second loop (102) and the main inductance connecting line (105) of the eight-shaped main inductance; Optionally, the first loop (101) and the second loop (102) of the eight-shaped main inductance are connected by the main inductance connecting line (105), the first loop (101) is arranged in the second quadrant of the coordinate system with the center as the origin, the second loop (102) is arranged in the fourth quadrant of the coordinate system, and the main inductance connecting line (105) is located on the horizontal coordinate axis of the coordinate system; The main inductance port comprises a main inductance first port (103) and a main inductance second port (104); The main inductance first port (103) is located on the side close to the horizontal coordinate axis of the second quadrant, is connected to the first loop (101) of the eight-shaped main inductance and is bent to the inside of the eight-shaped main inductance; and the main inductance second port (104) is located on the side close to the horizontal coordinate axis of the fourth quadrant, is connected to the second loop (102) of the eight-shaped main inductance and is bent to the inside of the eight-shaped main inductance.

6. The butterfly-shaped crossed main-tail inductor for a voltage-controlled oscillator according to claim 5, wherein The tail inductance wound by the eight-shaped metal wire comprises the first loop (201), the second loop (202) and the tail inductance connecting line (205) of the eight-shaped tail inductance; Optionally, the first loop (201) and the second loop (202) of the eight-shaped tail inductance are connected by a tail inductance connecting line (205), the first loop (201) is arranged in the first quadrant of the coordinate system, the second loop (202) is arranged in the third quadrant of the coordinate system, and the tail inductance connecting line (205) is located on the longitudinal coordinate axis of the coordinate system; The tail inductance port comprises a first tail inductance port (203) and a second tail inductance port (204); The first tail inductance port (203) is located on the side close to the horizontal coordinate axis of the fourth quadrant and is bent towards the outside of the eight-shaped tail inductance, and the second tail inductance port (204) is located on the side close to the horizontal coordinate axis of the second quadrant and is bent towards the outside of the eight-shaped tail inductance.

7. The butterfly-shaped cross- over main-tail inductor for a voltage-controlled oscillator according to claim 6, wherein The first loop (101) and the second loop (102) of the eight-shaped main inductance, the first main inductance port (103) and the second main inductance port (104), the tail inductance connecting line (205), the first loop (201) and the second loop (202) of the eight-shaped tail inductance are located on the top layer of the metal layer; The metal interlayer via comprises a first metal interlayer via (206) and a second metal interlayer via (207), the first metal interlayer via (206) is located in the fourth quadrant of the coordinate system, and the second metal interlayer via (207) is located in the second quadrant of the coordinate system; Optionally, the first metal interlayer via (206) connects the first loop (201) and the second loop (202) of the eight-shaped tail inductance, and the second metal interlayer via (207) connects the first tail inductance port (203) and the second tail inductance port (204).

8. The butterfly-shaped crossed main-tail inductor for a voltage-controlled oscillator according to any one of claims 3-4 and 6-7, wherein, The first loop (101) and the second loop (102) of the eight-shaped main inductance are symmetrically distributed about the origin of the coordinate system, and the first loop (201) and the second loop (202) of the eight-shaped tail inductance are symmetrically distributed about the origin of the coordinate system.

9. The butterfly-shaped cross-primaries-inductors for voltage-controlled oscillators according to any one of claims 3-4 and 6-7, characterized in that, The first main inductance port (103) and the second main inductance port (104) are symmetrically distributed about the origin of the coordinate system, and the first tail inductance port (203) and the second tail inductance port (204) are symmetrically distributed about the origin of the coordinate system.

10. The butterfly-shaped cross-primaries-inductors for voltage-controlled oscillators according to any one of claims 1-7, characterized in that, The main inductance wound by the eight-shaped metal wire is connected to the resonant loop of any LC voltage-controlled oscillator through the main inductance port to provide the frequency required for resonance, the tail inductance wound by the eight-shaped metal wire is connected to the common-mode point of the tail current of the voltage-controlled oscillator through the tail inductance port, and the frequency generated by the butterfly-shaped cross main-tail inductance in the resonant loop is represented as: wherein, is the resonant frequency of the main inductor in the butterfly-shaped crossed main-tail inductor, is the inductance of the main inductor wound in the shape of an eight, is the main capacitance value of the voltage-controlled oscillator, is the resonant frequency of the tail inductor in the butterfly-shaped crossed main-tail inductor, the frequency value at the second harmonic provides a filtering function, is the inductance of the tail inductor wound in the shape of an eight, is the filtering capacitance value.

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